Physics-Objective Related Question Answers
1076. When a tape recorder operates?
Magnetic energy is converted into sound energy
1077. Energy stored in the dry cells is?
Electrical
1078. Father of electricity?
Michael Faraday
1079. Potential difference in an electric circuit is measured by?
voltmeter
1080. The current in an electrical circuit is measured by?
ammeter
1081. The instrument used to detect the presence and direction of flow of current is called?
galvanometer
1082. The property by which a conductor opposes the flow of electric current through it, is known as?
resistance
1083. Electric current is the flow of?
electrons
1084. The colour of earth wire is generally?
green
1085. The filament of an electric bulb is made up of tungsten because it possess?
high melting point and resistance
1086. Fuse wire is made up of?
Tin and Lead (solder)
1087. When large current passes through the fuse wire, it melts away. Why?
Due to the low melting point of tin - lead alloy
1088. A device used instead of fuse?
MCB (Miniature Circuit Breaker - It works on the Principle of magnetic effect of electric current)
1089. What is the unit of intensity of Magnetic field?
Tesla
1090. Rubber, plastic, paper, glass, mica etc. are electrical ...........?
insulators
1091. Power of an ordinary torch cell is?
1.5 volt
1092. Magnetic effect of electric current was discovered by?
Oersted
1093. The law of electromagnetic induction have been used in the construction of a?
generator
1094. Which instrument is used to measure magnetic field?
Fluxmeter
1095. The device used for converting current from a lower voltage to a higher voltage is known as?
transformer
1096. What is electronics?
Study of behaviour of electrons; their control & use
1097. A material which allows only a feeble current to pass through it are called?
Semiconductors
1098. The process of adding certain impurities in the crystal structure of a semiconductor so as to improve its conductivity is called?
Doping
1099. The process of allowing electric current to flow in one direction only is?
Rectification
1100. What is Detection?
The process of extracting audio signals from the high frequency carrier waves is detection
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